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Free download in PDF RCC Structures Design MCQs and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams. These short solved questions or quizzes are provided by Gkseries.
81
If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as
[A]
wl²/4
[B]
wl²/8
[C]
wl²/10
[D]
wl²/12
82
The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
[A]
4 mm
[B]
5 mm
[C]
6 mm
[D]
7 mm
83
On an absolutely rigid foundation base, the pressure will
[A]
Be more at the edges of the foundation
[B]
Be uniform
[C]
Not be uniform
[D]
Be zero at the centre of the foundation
84
If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and
c are the modular ratio and maximum stress in the configuration of concrete, the strength of
column is
[A]
cAc + m cAsc
[B]
c(A – Asc) + m cAsc
[C]
c[A + (m – 1)ASC]
[D]
All the above
85
The live load to be considered for an accessible roof, is
[A]
Nil
[B]
75 kg/m3
[C]
150 kg/m 2
[D]
200 kg/cm 2
86
If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is
[A]
w1/w2 = l2/ l1
[B]
w1/w2 = (l2/l1)²
[C]
w1/w2 = (l2/l1)3
[D]
w /w = (l /l )4
87
According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
[A]
5 cm
[B]
10 cm
[C]
15 cm
[D]
20 cm
88
A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is
[A]
bn (fc/2) (d – n/3)
[B]
Atft (d – n/3)
[C]
½ n1 (1 – n1/3) cbd²
[D]
All the above
89
By over-reinforcing a beam, the moment of resistance can be increased not more than
[A]
10 %
[B]
15 %
[C]
20 %
[D]
25 %
90
A part of the slab may be considered as the flange of the T-beam if
[A]
Flange has adequate reinforcement transverse to beam
[B]
It is built integrally with the beam
[C]
It is effectively bonded together with the beam
[D]
All the above
91
If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by
[A]
(5/6) (r/1 + r²) M
[B]
(5/6) (r²/1 + r²) M
[C]
(5/6) (r²/1 + r3) M
[D]
(5/6) (r²/1 + r4) M
Answer: (5/6) (r²/1 + r4) M
92
The steel generally used in R.C.C. work, is
[A]
Stainless
[B]
Mild steel
[C]
High carbon steel
[D]
High tension steel
93
If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is
[A]
200 cm
[B]
300 cm
[C]
150 cm
[D]
100 cm
94
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be
[A]
8hp/ l
[B]
8hp/l²
[C]
8hl/p
[D]
8hl/p²
95
For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed
[A]
10
[B]
15
[C]
20
[D]
25
96
If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be.
[A]
Straight below centroidal axis
[B]
Parabolic with convexity downward
[C]
Parabolic with convexity upward
[D]
Straight above centroidal axis
Answer: Parabolic with convexity downward
97
If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by
[A]
D = 0.00775 aP
[B]
D = 0.0775 aP
[C]
D = 0.07775 aP
[D]
D = 0.775 Pa
98
If the shear stress in a R.C.C. beam is
[A]
Equal or less than 5 kg/cm2, no shear reinforcement is provided
[B]
Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
[C]
Greater than 20 kg/cm2, the size of the section is changed
[D]
All the above
99
For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
[A]
0.6
[B]
0.7
[C]
0.8
[D]
0.9
100
In a singly reinforced beam
[A]
Compression is borne entirely by concrete
[B]
Steel possesses initial stresses when embedded in concrete
[C]
Plane sections transverse to the centre line of the beam before bending remain plane after bending
[D]
Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
Answer: Plane sections transverse to the centre line of the beam before bending remain plane after bending
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